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The new antibiotic, XK-90, produced by Streptomyces sp. is active against Gram-positive and Gram-negative bacteria. The structure has been determined as N-acetyl-N'-(3-formyl-4-hydroxyphenyl)hydrazine (1) and is the second example of a naturally occurring antibiotic having the phenylhydrazine skeleton.

A new antibiotic XK-90. II. The structure of XK-90.